Although I haven't actually seen this happen, a client of mine is complaining that a few times this week his mouse cursor has mysteriously gone missing in action. Although the cursor is no longer visible it is still there, it just makes it real hard to click on anything. What could be the cause of this problem? The machine is an AMD K6-2 500 running Windows 98. Like I said, i haven't seen it do this, every time I use the machine it runs fine.